Idiom
Which statement regarding the mammalian heart is correct?

Blood is pumped from the heart via the atria
Oxygen-loaded blood moves only through the right side of the heart
When the right atrium contracts, it forces blood into the left atrium
In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs

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Idiom
To disabuse one's mind

To proceed cautiously so as to avoid risks and dangers
To conceal something
To banish from one's mind a thought
To remove a misapprehension

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